Equilibrium Constant (HSC SSCE Chemistry): Quizzes

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Equilibrium Constant
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What does the equilibrium constant KeqK_{eq} represent?

Ratio of product to reactant conc. at eq.

In the equilibrium expression, where are products and reactants placed?

Products in numerator, reactants in denom.

For 2A+B⇌3C2\text{A} + \text{B} \rightleftharpoons 3\text{C}, what is the correct KeqK_{eq} expression?

Keq=[C]3[A]2[B]K_{eq} = \frac{[\text{C}]^3}{[\text{A}]^2[\text{B}]}

What must be excluded from equilibrium expressions in heterogeneous systems?

Pure solids and pure liquids

For CaCO3(s)⇌CaO(s)+CO2(g)\text{CaCO}_3\text{(s)} \rightleftharpoons \text{CaO(s)} + \text{CO}_2\text{(g)}, what is KeqK_{eq}?

Keq=[CO2]K_{eq} = [\text{CO}_2]

If Q<KeqQ < K_{eq}, which direction will the reaction proceed?

Forward reaction favoured

What does a large KeqK_{eq} value (>> 1) indicate?

Equilibrium favours products

If KeqK_{eq} for a forward reaction is 2.4×10472.4 \times 10^{47}, what is KeqK_{eq} for the reverse?

4.2×10−484.2 \times 10^{-48}

What does Keq≪1K_{eq} \ll 1 indicate about the equilibrium position?

Most substances remain as reactants

If all coefficients in an equation are multiplied by 2, how does KeqK_{eq} change?

Knew=(Koriginal)2K_{new} = (K_{original})^2

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